I recently played Lichess game that left me confused.
My opponent had 1 second left on the clock when the game was suddenly drawn. There was no repitition nor was the 50-move rule invoked. Did the program cheat me?
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This was a draw by threefold repetition.
The final position:
6k1/pp1r2p1/2n4p/3p4/3P4/1BP1R3/PP3PPP/6K1 w - - 19 37
had been repeated three times in the game.
It first appeared after
32. ... Kg8, then after
34. ... Nc6 and finally after
36. ... Nc6.
Although players normally have to claim a draw by threefold repetition manually, Lichess performs the claim automatically if the time left on their clock is below some predefined threshold. Since your opponent only had 1 second left, this is likely what happened.